The d20 System is a tabletop role-playing game framework that uses a twenty-sided die, known as a d20, to determine the outcomes of actions and events. Players create characters with unique abilities and skills, and they engage in collaborative storytelling guided by a Game Master (GM). The system emphasizes player choice and character development. In the d20 System, players roll the d20 to resolve challenges, such as combat or skill checks, by comparing the result to a target number set by the GM. This mechanic is foundational to many popular games, including Dungeons & Dragons, making it a versatile and widely adopted system in the gaming community.